Drain trap valve



L. KIRSCHNER DRAIN TRAP VALVE Aug. 4, 1936.

Filed Deo. l5, 1952 juefzof Louss KmscHNER Patented Aug'. 4, 1936 UNITEDA STATES PATENT YOFFICE Y 4 Claims.

This invention relates generally to drain traps and more particularly to the construction of an improved back-pressure valve which is operative automatically to prevent any back flow through the trap or waste pipe, although permitting unrestricted normal passage of the water through the waste pipe into the sewer. Y

Among the principal objects of this invention is the provision of a back-pressure valve assembly which can be easily and quickly installed or set into desired position; which can be as readily removed for purposes of cleaning, repairing or inspecting the same; and which whilesimple and inexpensive to manufacture is exceedingly eili cient and durable in use. y

A further object of the invention is the provision of a back-pressure valve and drain assembly which is so designed and constructed as to be readily adapted for installation within the hub or enlarged head of any of the ordinary types of drain pipes, the-assembly being thus adapted for 5 installation Vimmediately beneath the outlet of an elevated basin or in connection withdrain pipes the upperl ends of which lie substantially iush into the floor Vor ground surface.

Other objects and advantages of the invention will be apparent more fully hereinafter.

The invention consists substantially in the combination, construction, location and relative arrangement of parts, all as will appear more fully hereinafter, as shown in the accompanying drawing and as finally pointed out in the appended claims. In the said accompanyingdrawlngb- Figure 1 is` a vertical sectional view showing the installation of one form of the back pressure valve assembly in the hub of a standard type of iloor drain; f

Figure 2 is a vertical sectional view of the valve assembly installed in the upper end of a drain pipe such as would be'employed in connection with anV elevated basin or the like; t 'y V Figure 3 is a vertical cross-sectional view similar to Figure 2 but showing a modied form of valve assembly; Y

Figure 4 is a vertical sectional view-showing the valve assembly in a modiiiedform of instal- 5 lation; Y 4

Figure 5 shows an installationsimilar to 'Figure 4 wherein a modified formof valve assembly is employed; v f., Y .i

Figure Gris avertical sectional view'of a com- 55v bined strainer and valve assembly; and, n

Figure 'l is a modified form of combined'strainer and valve assembly. Y

Referring now to the drawing and more particularly to Figures 1, 2, and 3, it will be observed that the constructions shown therein are 5 each characterized inv that the back pressure valve assembly is adapted to be installed and maint'ainedin position independently Aopl the strainer I0, the latter being of the usual form comprising preferably a horizontally disposed 10 perforated plate which is adapted to be positioned within thejenlarged upper end of a drain pipe. In the arrangement shown in Figure 2 thedrain pipe section II is enlarged to provide a chamber y I2, the upper lend of which is provided with an 15 annular flange I3. This drain pipe section II is suspended downwardly through a suitable. opening provided in the bottom of an elevated basin I4 o r the `like and is secured .in position by. a locking ring I5 which coacts with the annular 20 flange I3 of the drain pipe section t0 secure the latter to the basin. Preferably, packing vmaterial I6 is interposed betweenV the locking ring I5 and the bottom of the basin I4 in order to secure a water-tight connection between the. pipe section II and the basin. The pipe section II is provided at its upper end withv'an interiorly projecting flange I 'l affording an annular seat for the valve assembly,

designated generally bythe reference numeral 30 I8. 'I'his valve assembly, in the formshown inV Figure 2, comprises a substantially conically shaped member the upper end of which is provided with an outwardlydirected ,annular flange 20'adapted for seating engagement upon the an- 35 nular seat II of the pipe section II. Extending diametrically across the top ofthe member I9 .and lying substantially in the plane of the annularrange 20 thereof is acentrally apertured strap 2l, this `strap 2I being ,preferably formed 40 as an integral part of the member I9. The bottom end of the member I9 is reduced in diameter, as at 22, and is provided With a'valve seat 23.

Secured to the'diametrically extending strap 2| by means .of a screw 24 projecting` through the central aperture thereof is a vertically eX- tending tubular guide member L25, this latter member `beingarranged centrally within the member I9. Slidably rk-:ceived `within theV bore of the tubular guide member 25 is the enlarged 50 head 26 of a float valve stem 21, the float` 28 being secured in any desired manner to the lower end-ofsaid stem 21. A suitamy apertured plug 29 isj threaded'into Ythe bottom end of the tubular "guide member 25 and serves as the lower abutment for the enlarged head 26 of the valve stem. The screw 24 serves as the upper abutment for said head.

The member I9 together with its associated valve and valve step guide member is secured within the pipe section by means of suitable securing screws 30, these same securing screws serving also to secure the strainer I0 in position immediately above the valve body I9.

It will be observed that inthe arrangement shown in Figure 2 theV valve assembly-'may be readily removed as a unit from the pipe section it being merely necessary to remove these securing screws 30. Also, it will be observed that' the valve stem guide member 25 may bereadilyv removed from the valve body |9 simply by re v moving the screw 24 and that the valve stem 1tself and its associated float valve 28 may be'ref moved from the member 25 upon removal of the bottom plug 29.

In the arrangement shown in Figure- 3 the drain pipe section and its connection to the basin |4 is in all respects similar to the arrangement shown in Figure 2; The Valve `body 3| is, however, somewhat modified particularly in that it is provided withY a removable valvel seat 3.2. The upper end of this valve body 3| is also provided with van annular flange 33 which is adapted to be seated upon thelinternal annular flange l1 of the pipe section 'I'he valve body 3| Vis also provided with a diarnetricallyV extending strap 34, as in the arrangement shownin Fig-A ure 2, from the center point of which is suspended a stem 35, the upper end of this stem being f provided with a kerfed head 36. The stem 35 is preferably secured to the diametrically extending strap member34 by -means of a locking -nut l31 and a sleeve 3B embracing the .upper portion thereof, the sleeveA 38 being clamped against the under surface of the strap 34 by the locking nut 31.

The lower extremity of the stem 35 is provided with an enlarged head 39 which is adapted to be accommodated within the vertically extending bore 40 of a iloat 4|. rIvhis iioat 4| is preferably constructed of metal within. the interior of which is provided a verticallyv extending tube 42 the bottom end of which is closed, as at 43, and the upper end of which is adapted to threadedly receive a plug 44 through which the stem 35 is projected. It will thus'be observed that in the arrangement shown in Figure 3 the stem 35, which is xedly securedto the strap 34 of the valve body 3|, serves as a guide member along which the float 4| is vertically movable.

Figure 1 illustrates the adaptability of the valve assembly of the type such as is v shown in Figure 2 for installations'wherein the upper end of the drain pipe is substantially flush with the floor or ground. Thus, in Figure 1, the drain pipe, designated by the reference'-numeral 45, is .shown as being of the ordinary Ufwater-sealtyp, the vertically extending branch 46 ,ofvwhich is pro.- vided at its upper end with an enlarged hub 41. Fitted within this hub 41 and adapted to be permanently secured therein in any desired man-V ner is a tubular bushing 48. Suspended centrally within the hub 41`of the drain is thevalve body `49, the upper end of thisvalve body being provided with an annular ange 50 adapted for seating engagement upon the upper edge of the bushing 48. VAs in the arrangementw shown in- Figures12 and 3, the valve body 49 is also formed with a diametrically extending strap 5| from which is suspended altubular valvesteml guide member 52, the latter being secured to the strap 5| by means of a threaded stud 53 exactly as in the arrangement shown in Figure 2. Also as shown in Figure 2, the iloat valve 54 of the arrangement shown in Figure 1 is provided with a valve stem 55 having an enlarged head which is vertically slidable within the bore of the member 52. The bottom edge of the valve body 49 is beveled, as at 56, to provide a valve seat for the .floatyalvejk In the arrangements shown in Figures 4 and 5, the iioat valve assembly in each case is suspended V.from the cross bars 51 which are ordinarily provided at the bottom end of the usual type of sink tting 58. This fitting 58 is ordinarily projected through theV central opening provided therefor in the bottom sink or basin 59 and serves not onlyasa connection for the drain pipe but also as a means for securing the strainer 69 in positionythe strainer being ordinarily secured to the fitting 58by means of the screws 6|. The arrangements of Figures 4 and 5 are further alike inthat `each is-provided with a drain pipe comprising the vsection-s 62, 63, and 64, the section 62 being lcoupledto the tting 58 by coupling ring 65, while intermediate section 63 serves'not only as a connection between the sections 62 and 64 butalsoas a valve seat for Va float valve 66 of Figure 4 and 610i Figure 5. The section 64 is considerably enlarged to Vafford ample space for thepass'age of the water past lthe float valve when the latter is in its ,lowermost position (see for example Figure 5). To this end, the inter mediate fitting 63is provided with an interiorly threaded shoulder 68 constituting a seat for the bottom end of the iitting .62 while the lower end of the fitting V63A is exteriorly threadedfasfat 69, for engagement with the upper end of the enlarged section 64. 'Ihe valve seat 10 for the oat valve is,v in each case disposed interiorly of the enlarged section 64. Y

In the arrangement of Figure 4 the float valve 66 and its associated parts are secured to the cross straps 51. ofthe tting 58 in substantially the same manner as in the arrangement shown in Figure 2, the valve stem 1| ,being provided with an enlarged head 12 slidablewithin the tubular member 13.` On the other hand, in the arrangement shown'in Figure 5"the float valve 61 and its associated parts are secured to the cross straps 51 f of the fitting 58 substantially in the same manner as in the arrangement shown in Figure 3, the oat'61 beingvertically movable relatively to the fixed stem 14.

In the arrangement shown in Figures 6 and 7, the straineris shownas a part of the valve assembly.. In these arrangementa'it will be observed that the strainer 15 is formed as an integral part of the valve body 16,Y it being apparent thatthis combined strainer and valve body is adapted vfor positionment within a pipe section such as the section of Figure 2 or the hub 41 of Figure 1. In Figure 6 the float valve 11 is vertically movable relatively to the xed stem 18 asin the arrangements of'Figures 3 and 4, the sole difference being that the stem 18 is fixed directly to the strainer 15 instead of, to a cross strap as in the other arrangements. l Y

I The construction shown in Figure 7 differs somewhat from that shown in Figure 6 in that the iioatV valve 19 is centrally'bor'ed, as at 80, to permit the..` same tomove vertically upon the xed stem 8| the lower end of which is provided with astopvnut 82 which is vertically adjustable to limit the downward displacement of the oat valve 19. In the arrangement of Figure 7, the oat 19 is preferably of rubber, the upper extremity of the bore 80 thereof being beveled, as at 83, to accomodate a vertically adjustable tapered 5 nut 84 which functions to seal the upper end of the bore 80 when the oat 19 is in contact with its seat 85. Preferably, the bore 80 is lined with a metal tubular sleeve 86.

In the various arrangements, it will be observed that different forms of oat valves have been shown. It will be understood of course that the float valves and their supporting means'may be interchanged as desired in order to best suit conditions. For example, in Figure 2 the float Valve is shown as being constructed of sponge rubber. It will be understood of course that it may be constructed instead entirely of metal, as in Figure 3, or it may be constructed in the form of a metallic shell in which is set a renewable rubber 20, or other composition annulus 81 (see Figure 5) for contacting engagement with the valve seat. Furthermore, it will be observed that the float 28 of Figure 2 is in the form of a substantially semispherical member. It may also be spherically 25 shaped. The invention is susceptible of various changes and modifications without departing from the real spirit or general principles of the invention and accordingly it is intended to claim the same broadly, as well as specifically, as indi- 30 cated in the appended claims.

What is claimed as new and useful is:

1. A drain trap valve for drain pipes and the like comprising, in combination, a substantially vertically disposed tubular member connected to 35 the upper end of an enlarged drain pipe section,

the lower extremity of said member being provided with an annular valve seat, a diametrically extending cross-strap arranged within said member, a post member removably supported by said 4o cross-strap and extending axially of said mem-Y ber, a float member operatively associated with said post member and movable vertically with respect thereto into and out of engagement with said valve seat, and a bushing Vthreadedly engag- 45 ing one of said members and slidably engaging the other of said members, said members being separable from each other upon removal of said bushing.

2. A drain trap valve for drain pipes and the 50 like comprising, in combination, a main body member suspended within the upper end of an enlarged drain pipe section, the lower extremity of said body member being provided with an annular valve seat, a cross-strap extending dia- 55 metrically across the upper end of said main body, a tubular post secured to said cross-strap and extending coaxially with respect to said body member, a bushing threaded into the lower end of said post, a valve stem projected through said bushing and vertically movable within said tubular post, said valve stem having an enlargement 5 at its upper extremity for coaction with said bushing to limit its downward movement relatively to said post, and a iloat secured to the llovvermost extremity of said valve stem and adapted, when raised, to seat against said Valve l0 seat whereby to prevent the passage of water upwardly through said body member, said float and valve stem being separable as a unit from Said post upon removal of said bushing from the latter. 15

3. A drain trap valve for drain pipes and the like comprising, in combination, a main body member suspended within the upper end of an enlarged drain pipe section, the lower edge of said body member being provided with an annular Valve seat, a cross-strap extending diametrically across the upper end of said main body, a stem extending axially through said body andr suspended from said cross-strap, a oat vertically slidable upon said stem for movement into and out of engagement with said valve seat, said float being provided with an axial bore and said stem being provided with an enlarged head disposed Within said bore, and means threaded into the bore of said float to limit the movement of said head therewthin and adapted upon removal from said float to permit the separation of the latter from said stem.

4. In a construction of the character described, in combination, a drain pipe having an enlarged upper section, said section being provided with an interiorly projecting annular. flange, a Valve seat body secured to said flange for suspension within said drain pipe section, said valve seat body being provided with a diametrically extending cross-strap, a tubular post suspended from said cross-strap and arranged coaxially with respect to said valve seat body, means accessible from above said cross-strap for quick-detachably securing said post thereto, a iioat having a stem slidably within said post whereby said iloat is adapted for movement into and out of engagement with an annular valve seat formed in the bottom edge of said valve seat body, and a strainer overlying the upper end of said valve seat body, said strainer being removable from the drain pipe independently of said valve seat body and the aforesaid parts directly associated therewith whereby to afford access to said securing means for said post.

LOUIS KIRSCHNER. 

